Network signals became weak on iPhone 4S after iOS 6.1.3 update

I am using iPhone 4S. After I updated it with iOS 6.1.3 I have noticed that the network signals are pretty weak. Thus the main issue is that I am unable to make and receive calls properly. Also there is an issue with the internet sessions? Please help.

Re: Network signals became weak on iPhone 4S after iOS 6.1.3 update

Hello Friend,

Try my given suggestion's for solving your issue:-

First of all search for network in your device.
===>Now try to solve your problem by restart.
===>Some times single restart will solve such problem.
===>Remove simcard from your device once.
===>Install it again after 4-5 mins.
===>If still facing same issue then go for resetting your device.